Number Pattern : 19

Program:

 #include <stdio.h>
int main()
{
    int i,j,n;
    printf("How many lines: ");
  scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=(i*2-1);j++)
        {
            printf("%d",j);
        }
        printf("\n");
    }
    return 0;
}

Output:

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